English daisy festival (6)
I believe the answer is:
easter
'festival' is the definition.
(Christian festival)
'english daisy' is the wordplay.
'english' becomes 'E' (abbreviation).
'daisy' becomes 'aster' (I've seen this before).
'e'+'aster'='EASTER'
(Other definitions for easter that I've seen before include "Christian festival in Spring" , "Card, egg or Island" , "Monday of 1916 Rising" , "Christian celebration at the end of Lent" , "festival time" .)